Messages in this thread | | | Date | Tue, 3 Nov 2009 10:35:18 -0200 | From | Arnaldo Carvalho de Melo <> | Subject | Using build-ids in perf tools was Re: [PATCH -tip perf/probes 00/10] x86 insn decoder bugfixes |
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Em Tue, Nov 03, 2009 at 08:24:39AM +0100, Ingo Molnar escreveu: > * Roland McGrath <roland@redhat.com> wrote: > > As Frank mentioned, the kernel's and modules' allocated ELF notes (and > > thus build IDs) are already exposed in /sys. Tools like "eu-unstrip > > -nk" use this information today. > > Ah, i didnt realize we link with --build-id already, unconditonally, > since v2.6.23 (if ld supports it): > > | From 18991197b4b588255ccabf472ebc84db7b66a19c Mon Sep 17 00:00:00 2001 > | Subject: [PATCH] Use --build-id ld option > > So we have an SHA1 build-id already on the vmlinux and on modules, and > it's exposed in /sys/*/*/notes. Just have to make use of it in > tools/perf too.
I wasn't aware this was done upstream, ass-umed that it was only on kernel specfiles, will cook up a patch for consideration.
- Arnaldo
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